2007A&A...462L..57D

Query : 2007A&A...462L..57D

2007A&A...462L..57D - Astronomy and Astrophysics, volume 462L57-60 (2007/2-2)

Extensive multiband study of the X-ray rich GRB 050408. A likely off-axis event with an intense energy injection.

DE UGARTE POSTIGO A., FATKHULLIN T.A., JOHANNESSON G., GOROSABEL J., SOKOLOV V.V., CASTRO-TIRADO A.J., BALEGA Y.Y., SPIRIDONOVA O.I., JELINEK M., GUZIY S., PEREZ-RAMIREZ D., HJORTH J., LAURSEN P., BERSIER D., PANDEY S.B., BREMER M., MONFARDINI A., HUANG K.Y., URATA Y., IP W.H., TAMAGAWA T., KINOSHITA D., MIZUNO T., ARAI Y., YAMAGISHI H., SOYANO T., USUI F., TASHIRO M., ABE K., ONDA K., ASLAN Z., KHAMITOV I., OZISIK T., KIZILOGLU U., BIKMAEV I., SAKHIBULLIN N., BURENIN R., PAVLINSKY M., SUNYAEV R., BHATTACHARYA D., KAMBLE A.P., ISHWARA CHANDRA C.H. and TRUSHKIN S.A.

Abstract (from CDS):

Understand the shape and implications of the multiband ligth curve of GRB050408, an X-ray rich (XRR) burst. We present a multiband optical light curve, covering the time from the onset of the γ-ray event to several months after, when we only detect the host galaxy. Together with X-ray, millimetre and radio observations we compile what, to our knowledge, is the most complete multiband coverage of an XRR burst afterglow to date. The optical and X-ray light curve is characterised by an early flattening and an intense bump peaking around 6 days after the burst onset. We explain the former by an off-axis viewed jet, in agreement with the predictions made for XRR by some models, and the latter with an energy injection equivalent in intensity to the initial shock. The analysis of the spectral flux distribution reveals an extinction compatible with a low chemical enrichment surrounding the burst. Together with the detection of an underlying starburst host galaxy we can strengthen the link between XRR and classical long-duration bursts.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: bursts - techniques: photometric

Nomenclature: Fig.A1, Table A1: [DFJ2007] NN (Nos 1-12).

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 * zet Ori A SB* 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 680 0
4 [DFJ2007] 3 PM* 12 02 08.7005140560 +10 51 51.930475092 19.743 18.759 17.167 16.125 14.776 ~ 1 0
5 SDSS J120209.15+104923.8 * 12 02 09.1444259318 +10 49 23.798432794 19.114 19.174 18.601 18.213 17.835 ~ 2 0
6 SDSS J120210.37+105136.9 * 12 02 10.3644827256 +10 51 36.956451348 18.982 19.241 18.776 18.438 18.062 F3/F5V 2 0
7 [DFJ2007] 12 * 12 02 11.32 +10 51 11.3 21.129 21.249 20.810 20.507 20.025 ~ 1 0
8 [DFJ2007] 5 * 12 02 11.7467915520 +10 54 59.222082312 18.204 17.855 17.089 16.627 16.218 ~ 1 0
9 [DFJ2007] 4 * 12 02 14.68 +10 54 01.2 18.200 18.508 18.028 17.671 17.292 ~ 1 0
10 [DFJ2007] 10 * 12 02 14.76 +10 52 54.6   21.885 20.528 19.617 18.631 ~ 1 0
11 [DFJ2007] 9 * 12 02 17.02 +10 51 45.5 20.510 20.805 20.216 19.673 18.951 ~ 1 0
12 [DFJ2007] 11 * 12 02 17.10 +10 51 02.5   23.674 22.376 21.823 20.947 ~ 1 0
13 GRB 050408 gB 12 02 17.320 +10 51 10.00           ~ 153 0
14 [DFJ2007] 6 * 12 02 22.95 +10 53 57.8 18.896 19.098 18.638 18.300 17.980 ~ 1 0
15 [DFJ2007] 8 * 12 02 24.6856759272 +10 49 54.347534400 17.237 17.406 17.020 16.652 16.324 ~ 1 0
16 [DFJ2007] 7 PM* 12 02 25.2099682704 +10 51 43.227119340 20.034 19.143 17.681 16.742 15.695 ~ 1 0
17 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1

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